"The Return of Doctor Mysterio" is an episode of the British science fiction television series Doctor Who. First broadcast on BBC One on 25 December 2016, it is the twelfth Christmas special since the show's revival in 2005. It was written by Steven Moffat and directed by Ed Bazalgette. The episode received generally positive reviews from critics.

Steven William Moffat is a Scottish television writer, television producer and screenwriter. He is best known for his work as the second showrunner and head writer of the 2005 revival of the BBC sci-fi television series Doctor Who and co-creating and co-writing the contemporary crime drama television series Sherlock, based on Sir Arthur Conan Doyle's Sherlock Holmes stories. In the 2015 Birthday Honours, Moffat was appointed Officer of the Order of the British Empire (OBE) for his services to drama.